As a kind of clean and renewable energy,tidal current energy is becoming increasingly popular all over the world with the shortage of energy and environmental problems becoming more and more severe.A floating tidal cu...As a kind of clean and renewable energy,tidal current energy is becoming increasingly popular all over the world with the shortage of energy and environmental problems becoming more and more severe.A floating tidal current power station is a typical type of tidal current power transformers which can sustain the loads of wind,waves,and current,and even the extreme situation of a typhoon.Therefore,the mooring system must be reliable enough to keep the station operating normally and to survive in extreme situations.The power station examined in this paper was installed at a depth of 40 m.A 44 mm-diameter R4-RQ4 chain was chosen,with a 2 147 kN minimum break strength and 50 kN pretension.Common studless link chain was used in this paper.Based on the Miner fatigue cumulative damage rule,S-N curves of chains,and MOSES software,a highly reliable mooring system was designed and analyzed.The calculation results show that the mooring system designed is reliable throughout a 10-year period.It can completely meet the design requirements of American Petroleum institution（API）.Therefore,the presented research is significant for advancing the design of this kind of power station.展开更多
After the nuclear power plant accident in Japan, Korean government has set the national goal to produce the electricity by renewable energy sources up to 11% by 2035 which is not easy to achieve without ocean energy d...After the nuclear power plant accident in Japan, Korean government has set the national goal to produce the electricity by renewable energy sources up to 11% by 2035 which is not easy to achieve without ocean energy development. The demand on the clean energy supply has been increased recently and there are many renewable energy development projects and plans announced worldwide. The ocean energy can be produced from tidal current, wave, tidal barrage and ocean thermal sources. The first step is to estimate the resource assessment for each energy source. There are several assessment methods introduced from IEA （International Energy Agency）, IRENA （International Renewable Energy Agency）, NREL （National Renewable Energy Laboratory）, EU ERENE （European Community for Renewable Energy）, Bonn University, DLR （German Aerospace Center）, etc.. Even these known methods have some sort of similarity; there are different definitions and classifications among them. In this paper, the four-step energy potentials are defined and introduced as theoretical, geographical, technical and market potentials. The theories for each step are presented for ocean energies together with clear definitions. As the tidal current energy research and development are active in Korea having very strong tidal current speed along the west and south coastal regions, the detail procedure for each step of energy potential assessment is introduced for tidal current energy. The paper will illustrate the case study of tidal current power assessment in western coastal region, South Korea with highlighting the key aspects in determining the resource potentials.展开更多
Tidal current power is one of the promising and reliable renewable energies with the advantage of continuous and predictable resource. It can make stable electricity regardless of weather conditions or seasons all yea...Tidal current power is one of the promising and reliable renewable energies with the advantage of continuous and predictable resource. It can make stable electricity regardless of weather conditions or seasons all year around. The required technologies for tidal current power in the ocean have been developed for years and now recognized that it could be commercialized after intensive field tests and successful demonstrations. There are several tidal farm development projects in the world, such as the MeyGen project in UK with its commercialization at hand. However, various research subjects in the tidal current energy field are seeking improvements and industrialization of tidal current power in terms of economy and technical reliability. This paper introduces the resource assessment procedure of tidal energy that has been applied in Korea coastal regions. The key research subjects for tidal current power together with the interaction effect of multi-arrangement is described. Also, this paper is to introduce the research output of each subject such as turbine design, experimental validation, turbine interaction and wake, multi-array module, FSI (fluid-structure interaction), and duct application.展开更多
There are many types of tidal current power generation devices,and it is necessary to make comprehensive evaluation of tidal current power generation devices in order to provide valuable reference for the improvement ...There are many types of tidal current power generation devices,and it is necessary to make comprehensive evaluation of tidal current power generation devices in order to provide valuable reference for the improvement of their performance indexes.On the basis of the analysis of the tidal current power generation device performance indexes,the hierarchical model for comprehensive evaluation of device performance is given in this paper.By normalizing the membership matrix elements based on fuzzy comprehensive evaluation model,all the values of the matrix elements are restrained in the range of0.0 to 1.0,hence the complexity of the calculations is reduced.Vector similarity is used to determine the expert weights which reflect the knowledge and experience of the experts.This paper presents an improved method for rank correlation analysis,and calculates the comprehensive weight value and the final evaluation results of tidal current power generation devices.The presented method improves the credibility of the evaluation.In the end,measured data of two units of tidal current power generation devices are evaluated in the paper,and the effectiveness of the presented method is verified.展开更多
Tidal current turbines(TCTs) are newly developed electricity generating devices.Aiming at the stabilization of the power output of TCTs,this paper introduces the hydraulic transmission technologies into TCTs.The hydro...Tidal current turbines(TCTs) are newly developed electricity generating devices.Aiming at the stabilization of the power output of TCTs,this paper introduces the hydraulic transmission technologies into TCTs.The hydrodynamics of the turbine was analyzed at first and its power output characteristics were predicted.A hydraulic power transmission system and a hydraulic pitch-controlled system were designed.Then related simulations were conducted.Finally,a TCT prototype was manufactured and tested in the workshop.The test results have confirmed the correctness of the current design and availability of installation of the hydraulic system in TCTs.展开更多
双向潮流适应性和运行可靠性是水平轴潮流能发电系统需要解决的两个关键问题。文中研究的新型潮流能发电系统由自适应双向流水平轴定桨距潮流能透平、直驱永磁发电机、功率变换器、蓄电池储能系统以及卸荷负载组成。根据我国潮流能特点...双向潮流适应性和运行可靠性是水平轴潮流能发电系统需要解决的两个关键问题。文中研究的新型潮流能发电系统由自适应双向流水平轴定桨距潮流能透平、直驱永磁发电机、功率变换器、蓄电池储能系统以及卸荷负载组成。根据我国潮流能特点和直驱永磁发电系统的运行特性,采用翼型尾翼完成透平的双向潮流对流功能。针对离网型潮流能发电系统的功率控制,设计了基于三相不可控整流桥和双管BUCK-BOOST变换器的功率变换电路。基于Matlab/Simulink软件对20 k W潮流能发电系统各部分进行了建模与仿真分析。在实海况环境进行了现场试验。研究表明,设计的离网型水平轴潮流能发电系统能够有效地利用双向潮流能,而且在结构设计方面所采取的措施提高了系统的可靠性。展开更多
基金Supported by the National "863" Program (Grant No.2007AA05Z450)the National S&T Program (Grant No.2008BAA15B04)+2 种基金2010 Ocean Special Funds (Grant No. ZJME2010GC01, No. ZJME2010CY01)Fundamental Research Funds for the Central Universities (GK2010260106)"111 Project" Foundation (Grant No. B07019) from State Administration of Foreign Experts Affairs of China and Ministry of Education of China
文摘As a kind of clean and renewable energy,tidal current energy is becoming increasingly popular all over the world with the shortage of energy and environmental problems becoming more and more severe.A floating tidal current power station is a typical type of tidal current power transformers which can sustain the loads of wind,waves,and current,and even the extreme situation of a typhoon.Therefore,the mooring system must be reliable enough to keep the station operating normally and to survive in extreme situations.The power station examined in this paper was installed at a depth of 40 m.A 44 mm-diameter R4-RQ4 chain was chosen,with a 2 147 kN minimum break strength and 50 kN pretension.Common studless link chain was used in this paper.Based on the Miner fatigue cumulative damage rule,S-N curves of chains,and MOSES software,a highly reliable mooring system was designed and analyzed.The calculation results show that the mooring system designed is reliable throughout a 10-year period.It can completely meet the design requirements of American Petroleum institution（API）.Therefore,the presented research is significant for advancing the design of this kind of power station.
文摘After the nuclear power plant accident in Japan, Korean government has set the national goal to produce the electricity by renewable energy sources up to 11% by 2035 which is not easy to achieve without ocean energy development. The demand on the clean energy supply has been increased recently and there are many renewable energy development projects and plans announced worldwide. The ocean energy can be produced from tidal current, wave, tidal barrage and ocean thermal sources. The first step is to estimate the resource assessment for each energy source. There are several assessment methods introduced from IEA （International Energy Agency）, IRENA （International Renewable Energy Agency）, NREL （National Renewable Energy Laboratory）, EU ERENE （European Community for Renewable Energy）, Bonn University, DLR （German Aerospace Center）, etc.. Even these known methods have some sort of similarity; there are different definitions and classifications among them. In this paper, the four-step energy potentials are defined and introduced as theoretical, geographical, technical and market potentials. The theories for each step are presented for ocean energies together with clear definitions. As the tidal current energy research and development are active in Korea having very strong tidal current speed along the west and south coastal regions, the detail procedure for each step of energy potential assessment is introduced for tidal current energy. The paper will illustrate the case study of tidal current power assessment in western coastal region, South Korea with highlighting the key aspects in determining the resource potentials.
文摘Tidal current power is one of the promising and reliable renewable energies with the advantage of continuous and predictable resource. It can make stable electricity regardless of weather conditions or seasons all year around. The required technologies for tidal current power in the ocean have been developed for years and now recognized that it could be commercialized after intensive field tests and successful demonstrations. There are several tidal farm development projects in the world, such as the MeyGen project in UK with its commercialization at hand. However, various research subjects in the tidal current energy field are seeking improvements and industrialization of tidal current power in terms of economy and technical reliability. This paper introduces the resource assessment procedure of tidal energy that has been applied in Korea coastal regions. The key research subjects for tidal current power together with the interaction effect of multi-arrangement is described. Also, this paper is to introduce the research output of each subject such as turbine design, experimental validation, turbine interaction and wake, multi-array module, FSI (fluid-structure interaction), and duct application.
基金supported by Marine Renewables Special Funds to Implement Programs funded by the government of China(No.GHME2012ZC02)
文摘There are many types of tidal current power generation devices,and it is necessary to make comprehensive evaluation of tidal current power generation devices in order to provide valuable reference for the improvement of their performance indexes.On the basis of the analysis of the tidal current power generation device performance indexes,the hierarchical model for comprehensive evaluation of device performance is given in this paper.By normalizing the membership matrix elements based on fuzzy comprehensive evaluation model,all the values of the matrix elements are restrained in the range of0.0 to 1.0,hence the complexity of the calculations is reduced.Vector similarity is used to determine the expert weights which reflect the knowledge and experience of the experts.This paper presents an improved method for rank correlation analysis,and calculates the comprehensive weight value and the final evaluation results of tidal current power generation devices.The presented method improves the credibility of the evaluation.In the end,measured data of two units of tidal current power generation devices are evaluated in the paper,and the effectiveness of the presented method is verified.
基金Project supported by the National Natural Science of China (Nos. 50505043 and 50735004)the National High Tech R&D Program (863) of China (No. 2007AA05Z443)
文摘Tidal current turbines(TCTs) are newly developed electricity generating devices.Aiming at the stabilization of the power output of TCTs,this paper introduces the hydraulic transmission technologies into TCTs.The hydrodynamics of the turbine was analyzed at first and its power output characteristics were predicted.A hydraulic power transmission system and a hydraulic pitch-controlled system were designed.Then related simulations were conducted.Finally,a TCT prototype was manufactured and tested in the workshop.The test results have confirmed the correctness of the current design and availability of installation of the hydraulic system in TCTs.
文摘双向潮流适应性和运行可靠性是水平轴潮流能发电系统需要解决的两个关键问题。文中研究的新型潮流能发电系统由自适应双向流水平轴定桨距潮流能透平、直驱永磁发电机、功率变换器、蓄电池储能系统以及卸荷负载组成。根据我国潮流能特点和直驱永磁发电系统的运行特性,采用翼型尾翼完成透平的双向潮流对流功能。针对离网型潮流能发电系统的功率控制,设计了基于三相不可控整流桥和双管BUCK-BOOST变换器的功率变换电路。基于Matlab/Simulink软件对20 k W潮流能发电系统各部分进行了建模与仿真分析。在实海况环境进行了现场试验。研究表明,设计的离网型水平轴潮流能发电系统能够有效地利用双向潮流能,而且在结构设计方面所采取的措施提高了系统的可靠性。
